The Coupled Multi-Physical Field Analysis And Optimization Design Of Electromagnetic Induction Heating System

With the development of society,science and technology,the importance of protecting the environment has become more and more prominent.Nowadays,energy conservation,emission reduction and environmental protection have become to the very important themes.In the field of heating,the traditional way is to use open flame which is produced by burning coal,oil,natural gas,and so on.This heating method will produce various harmful gases which will cause serious pollution to the environment.And another disadvantage is that most of the heat cannot be effectively utilized during the heating process which will result in wasted resources.In order to solve the above problems,electromagnetic induction heating has appeared.Electromagnetic induction heating technology has the follow advantages:high heating efficiency,non-contact heating,safety and pollution-free.Because of these advantages,electromagnetic induction heating technology widely used in industrial production and daily life to replacing the traditional open flame heating method.Although induction heating technology has many advantages,there are still many problems need to be solved.For example,in the heating process,the temperature distribution of the heated pot is not uniform which will reduce the heating efficiency and cause certain damage to this pot.In this paper,the basic theory of electromagnetic field and temperature field and finite element analysis method has been used to analysis the electromagnetic induction heating system.Temperature field and electromagnetic field distribution of three coil structures has been obtained by coupling analysis.The electromagnetic field and temperature field distribution of the pot under the same operating conditions has been compared.And the results show that the temperature distribution uniformity of the pot is not good in these three typical coil structures.The center temperature of the pot is relatively low and the temperature in the quarter of diameter is highest.And the difference between the highest temperature and the lowest temperature of the pot is large.This paper proposes an Improved Non-Dominated Genetic Algorithm with Elite Strategy(Improved NSGA-?)which will be used to optimize one of the most typical coil structures.Based on the NSGA-II algorithm,the Improved NSGA-II adding chaotic operators and repair operators to solve the disadvantages that the original algorithm lack of diversity and cannot be applied to the conditions with strong constraints.The improved algorithm is used to optimize the distance between each adjacent wire of the coil,which effectively improves the uniformity of the temperature distribution and the heating efficiency of the pan.In other word,the difference between the maximum temperature point and the minimum temperature point of the pan is minimized and the overall average temperature of the pan is maximized.Finally,on the basis of the above optimized coil,the improved NSGA-? method is used to optimize the shape,quantity and position of ferrite in the optimized coil structure,and a satisfactory overall model of the coil is obtained.